Permutation lock



Dc.1'1,1928'. I I 1,695,080

H. A. BARRETT PERMUTATION LOCK Original Filed May 13, 1925 FIG. 2.

7 F123" lr Patented Dec. 11, 1928 UNITED STAT-Esp.

HARRY A. BARRETT, or" rHILAnELrnIA, 1 ENNSYLVANIA;ASSIGNOR 'ro BARRETT PAT ENT' FFl CE.

LOCK COMPANY, INC., A CORPORATION OF DELAWARE.

'PERMUTATION LOCK.

Applicationfiled May 13, 1925, Serial No- 29,886. 'Renewed May 19, 1928.

This invention, generally stated, relates to permutation locks and hasmore especialrethe results sought by the leading object;

Other and further objects not at this time appearing will be hereinaftermore specifically referred to.

The inventionv consists of the novel construction hereinafter describedand finally claimed.

The nature, characteristic features and scope of the invention will bemore fully understood from the following description taken in connectionwith the accompanying drawings forming part hereof, and in which:

Fig. 1, is a view in elevation of the lock.

Fig. 2, is a view similar to Fig. 1 with the front plate and its dialremoved.

Fig. 3, is a view in section taken upon the line 33 of Fig. 2.

Fig. 4, is a' detached View of one of the guides shown in Figs. 2 and 3.

Fig. 5, is a face view of one of the tumbler rings.

Fig. 6, is an elevational view of the rotatable post shown in Figs. 2and 3.

Fig. 7, is an edge view thereof.

Fig. 8 represents a slotted. disc hereinafter referred to; and

Fig. 9, is a view of the base part detached.

For the purpose of illustrating my invention I have shown in theaccompanying draws ings one form thereof which is at present preferredby me, since the same has been found in practice to give satisfactoryand reliable results, although it is to be understood that the variousinstrumentalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of the instrumentalities as hereinshown and described.

-R-eferring to the drawings, the reference numeral 10 designates adished casing having vided with a knob or handle 17. Surroundingsaidpost16 are a series of tumbler rings 18 each provided internallywith a. projection 19 and externally with a notch 20. These rings aresupported and guided in a. circular path through fixed guides 21,radially arranged with the opposed faces thereof grooved as at 22. Thusin operation as the post 16 is rotated by handle 17 the edge of saidpost engages'with the inner projection 19 of a tumbler ring for movingsame to a desired position. During this movement the butt 23 of a dog24, pivoted as at 25, rides upon the peripheries of the tumbler ringsthe opposite end of the dog cooperates with the notched part 26 of ashackle 27 as best seen in Fig. 2. When the total number of tumblerrings 19, of which threeare shown in the drawings for illustrativepurposes, have been properly moved so that their notches are inalignment it is evident that the butt 23 of dog 24 willuncler theinfluence of gravity drop into the aligned notches and thus permit thewithdrawal of the notched end of the shackle from engagement with saiddog. The shackle in open position, because of its cam-like end "28abutting against the butt of the dog 24, maintains the knob, post andtumbler rings against rotation since the dog is thus held firmly in thenotches ofsaid rings. It is thus apparent that with few and simple partsan efficient lock is provided, which after assembly possessesno delicateparts to become deran ed and no springs to weaken and get out of or er.Further, because of the simple arrangement of tumbler rings and theirgrooved guides dislocation of said rings is practically eliminated whichis most desirable in combination looks. a e I It will now be apparentthat I have devised a novel and useful construction which embodies thefeatures of advantage enumerated as desirable in the statement of theinvention and the above description and while I have in the presentinstance shown and described the preferred embodiment thereof which hasbeen found in practice to give satisoperative through said rings andfixed to said knob, for engaging with said projections, a shackle, and apivotal dog one end of which is adapted to ride upon the peripheries ofsaid rings and the opposite end of which is for engaging said shackle.

2. In a lock of the character stated a casing having fixed thereinradially disposed guides having opposed grooved faces, a plurality oftumbler rings rotatably fitted to said grooves, each ring having aninner projection and an outer notch, a knob, a flat rotatable postoperative through said rings and fixed to said knob, for engaging withsaid projections, a shackle, and a pivotal dog one end of which isadapted to ride upon the peripheries of said rings and the opposite endof which is for engaging said shackle.

3. In a lock of the character stated a casing having fixed thereinradially disposed guides havingopposed grooved faces, a plurality oftumbler rings rotatably fitted to said grooves, each ring having aninner projection and an outer notch, a knob, a rotatable post operativethrough said rings and fixed to said knob, for engaging with saidprojections, a pivotal dog, a shackle having a pivotal cam-like end forcontacting with the butt end of said dog, one end of which dog isadapted to ride upon the peripheries of said rings and the opposite endof which is for engaging said shackle.

In testimony signed my name.

HARRY A. BARRETT.

whereof, I have hereunto'

